DPC01DM23 is a true RMS 3-phase voltage monitoring relay designed for DIN-rail mounting that operates on 3-phase (3P) and 3-phase with neutral (3P+N) systems. It monitors phase loss, phase sequence, overvoltage, undervoltage, voltage asymmetry, and tolerance with a rated voltage range of 208 to 240 V line-to-line AC (±15%, 177 to 276 V), frequency range of 50 to 60 Hz, and power consumption of less than 1.5 VA. The device features two independent delay functions adjustable from 0.1 to 30 seconds for over/under voltage and asymmetry/tolerance alarms, two changeover relay outputs (SPDT), front dial adjustable setpoints, and DIP switch configuration for nominal voltage selection and operating mode. With ultra-high harmonic immunity, adjustable power ON delay (1 s or 6 s), and status LED indication (green for power supply, red for alarm, yellow for relay output), the DPC01DM23 is ideal for industrial power distribution systems requiring reliable mains monitoring and protection against voltage anomalies.